package com.qshu.student.interceptor;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.qshu.student.annotation.AdminLoginToken;
import com.qshu.student.annotation.PassToken;
import com.qshu.student.entity.StudentInfo;
import com.qshu.student.service.studentService;
import com.qshu.student.utils.TokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import com.auth0.jwt.algorithms.Algorithm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;
import java.util.Map;

public class AuthenticationInterceptor implements HandlerInterceptor {
@Autowired studentService studentServiceimpl;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) {
        String token = httpServletRequest.getHeader("Authorization");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
//        检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(AdminLoginToken.class)) {
            AdminLoginToken adminLoginToken = method.getAnnotation(AdminLoginToken.class);
            if (adminLoginToken.required()) {
                // 执行认证
                if (token == null) {
                    throw new TokenException(403,"无token，请重新登录");
                }
//                 获取 token 中的 studentId
                int studentId = Integer.parseInt(TokenUtil.getAdminUserId(token));
                Map adminUser = studentServiceimpl.getOnebyId(studentId);
                if (adminUser == null) {
                    throw new TokenException(403,"用户不存在，请重新登录");
                }
                System.out.println(token);
                // 验证 token
                JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(TokenUtil.SECRET)).build();
                try {
                    jwtVerifier.verify(token);
                } catch (JWTVerificationException e) {
                    throw new TokenException(403,"token不合法");
                }
            }
        }
        System.out.println("请求前拦截"+token);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
//        System.out.println("请求后拦截"+o);
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
//        System.out.println("渲染后拦截"+o);
    }
}